does it do good on the back springs? i couldnt find anything using search? anyways it sells for $50 on ls1speed.com and comes with air fittings.

 

can you post a link? I don't know what you're refering to. air fitting... sounds like a tool to hold the valves up in which case you can just use the TDC method which is free and works well. I used a tool similar to Larry's. I modified the autozone tool to operate like his does.

 

Its On Ls1speed.com Look In The Valvetrain Section. The Air Fitting Is To Hold The Valves Up.